1

SY100HA643

Micrel, Inc.

M9999-032906

hbwhelp@micrel.com or (408) 955-1690

The SY100HA643 is an enhanced dual supply, low skew

translating 1:8 clock driver. Devices in the Micrel H600

translators series utilize the 28-lead PLCC for optimal power

pinning, signal flow through and electrical performance. The

dual-supply HA643 is similar to the H641, which is a single-

supply 1:9 version of the same function, with higher

performance than the H643 versions.

The device features a 48mA TTL output stage, with AC

performance specified into a 20pF load capacitance.

A

Latch is provided on-chip. When LEN is LOW (or left open,

in which case it is pulled LOW by the internal pulldowns)

the latch is transparent. A HIGH on the enable pin (EN)

forces all outputs LOW.

The 100HA643 is compatible with 100K ECL logic levels.

DESCRIPTION

FEATURES

■ ECL/TTL version of popular ECLinPS™ E111

■ 400ps within device skew

■ 800ps part-to-part skew

■ Latch

■ Differential internal design

■ Dual supply

■ Reset/Enable

■ Multiple TTL and ECL power/ground pins

■ Fully compatible with MC100H643

■ Higher performance than H643 versions

■ Industrial temperature availability

■ Available in 28-pin PLCC package

DUAL SUPPLY

OCTAL ECL-TO-TTL

Rev.: H

Amendment: /0

Issue Date:

March 2006

SY100HA643

BLOCK DIAGRAM

Pin

Function

OGND

TTL Output Ground (0V)

OVTTTL

IGND

Internal TTL GND (0V)

IVT

ECL Ground (0V)

D, D

Signal Input (ECL)

Q0 - Q7

Signal Outputs (TTL)

EN

Enable Input (ECL)

LEN

Latch Enable Input (ECL)

PIN NAMES

D

D

LEN

EN

D

Q

TTL OUTPUTS

Precision Edge is a registered trademark of Micrel, Inc.